I think that this leve of precaution is a bit of overkill, but I'm always loath to say that about any harm reduction measure. (That said I'm on 3,600mg of gabapentin, 20mg of valium, 8mg of suboxone myself + some other meds for depression + I drink quite a bit. This is not to say that you should combine stuff at this level or at these doses. I have a serious tolerance to all the above.) It will potentiate sedation of various other things but 600mg is not really going to do all that much. It may be wise, well, it's always wise, regardless of circumstances to, with regards to dose, "start low and go slow" when it comes to adding things like GHB or benzos. Or alcohol. Do you drink with gabapentin? If you do, this will probably give you at least some idea of how it's going to interact with GHB. Not anything in terms of numbers or precise degree of magnification, nothing like that, but in terms of whether there is a serious amount of magnification or more or less not much. Basically, I wouldn't necessarily rule out combinations, but just be careful as you initially chose your dose and especially when you re-dose.
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